docs: def mget(self, ids, index=None, doc_type=None, **query_params):
          """
          Get multi JSON documents.
  
          ids can be:
              list of tuple: (index, type, id)
              list of ids: index and doc_type are required
          """
          if not ids:
              return []
  
          body = []
          for value in ids:
              if isinstance(value, tuple):
                  if len(value) == 3:
                      a, b, c = value
                      body.append({"_index": a,
                                   "_type": b,
                                   "_id": c})
                  elif len(value) == 4:
                      a, b, c, d = value
                      body.append({"_index": a,
                                   "_type": b,
                                   "_id": c,
                                   "fields": d})
  
              else:
                  if index is None:
                      raise InvalidQuery("index value is required for id")
                  if doc_type is None:
                      raise InvalidQuery("doc_type value is required for id")
                  body.append({"_index": index,
                               "_type": doc_type,
                               "_id": value})
  
          results = self._send_request('GET', "/_mget", body={'docs': body},
                                       params=query_params)
          if 'docs' in results:
              model = self.model
              return [model(self, item) for item in results['docs']]
          return []